Coltsfoot lower epidermis with rust (coltsfoot rust gall, Puccinia poarum) in Petiayarvi, north from Saint Petersburg. Russia, July 21, 2017
Shosseynaya ul., Petyayarvi, Leningradskaya oblast', Russia, 188732Synonyms: Aecidium petasitis, Aecidium tussilaginis, Pleomeris poarum, Puccinia conspicua.
Common name: coltsfoot rust gall.
Russian name: Puktsiniya myatlikovaya.
Extract from Wikipedia article: Puccinia poarum,, the coltsfoot rust gall or meadow grass rust, is a plant pathogen. This fungal parasite forms a bright yellow gall, 1–2 cm across, on the underside of leaves of the coltsfoot (Tussilago farfara) and infects, but does not gall grasses of the family Poaceae.
Puccinia poarum is a species of rust fungus that infects plants in the family Poaceae. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found on various hosts, including meadow grasses and cereals. The fungus is characterized by its yellow to brown spores and causes disease symptoms such as chlorosis, necrosis, and deformation of infected plant tissues. It is widely distributed in the region, with reports of its presence in numerous localities, including urban parks, agricultural fields, and natural habitats.
Coltsfoot lower epidermis with rust (coltsfoot rust gall, Puccinia poarum) in Petiayarvi, north from Saint Petersburg. Russia, July 21, 2017Shosseynaya ul., Petyayarvi, Leningradskaya oblast', Russia, 188732
Coltsfoot rust gall fungus, Puccinia poarum, in Sosnovka Park. Saint Petersburg, Russia, May 27, 2019Unnamed Road, Sankt-Peterburg, Russia
Underside of a leaf with coltsfoot rust gall fungus, Puccinia poarum, in Sosnovka Park. Saint Petersburg, Russia, May 27, 2019Unnamed Road, Sankt-Peterburg, RussiaObservations of the fungus Puccinia poarum in Leningrad Oblast and north-western Russia reveal its presence on coltsfoot plants. In Petiayarvi, north of Saint Petersburg, the fungus was found on the lower epidermis of coltsfoot leaves, forming rust galls, on July 21, 2017. Similar observations were made in Sosnovka Park, Saint Petersburg, on May 27, 2019, where the coltsfoot rust gall fungus was found on both the upper and underside of leaves. The fungus forms distinct galls on the underside of the leaves, indicating its presence. These observations suggest that Puccinia poarum is active in the region during the summer months, infecting coltsfoot plants and causing the formation of rust galls. The fungus appears to be widespread in the area, with multiple sightings in different locations within Leningrad Oblast and north-western Russia.
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